By John G. Horgan, Paul Gill, Noemie Bouhana, James Silver and Emily Corner

Lone actor terrorists (sometimes referred to as ‘lone wolves’) and mass murderers are more often than not assumed to be distinct, with little validity for comparison. Yet, both engage (or attempt to engage) in largely public and highly publicized acts of violence and often use similar weapons. - Using a series of bivariate and multivariate statistical analyses, we compared demographic, psychological and offense-related behavioral variables across and between 71 lone actor terrorists and 115 solo mass murderers. - Results indicate there is little to distinguish these offender types in terms of their socio-demographic profiles. However, their behaviors significantly differ with regards to (a) the degree to which they interact with co-conspirators (b) their antecedent event behaviors and (c) the degree to which they leak information prior to the attack.

Washington, DC: U.S. Department of Justice, 2016. 122p.

By Jonathan Ilan

Crime must be understood as a facet of class-cultural interaction, given that the majority of the convicted are young, urban, disadvantaged males, while the criminal law enshrines and enforces what could be viewed as middle-class behavioural expectations. Class-cultural dynamics have become increasingly complex in late modernity, however, with traditional certainties and class boundaries becoming blurred and indistinct. This thesis examines the social and cultural factors underlying youth offending and justice in an inner-city Dublin community through an ethnographic treatment of the various actors in a locality which has undergone significant change in recent years. The Crew, a group of young offenders, are shown to adhere to a ‘rough’or ‘street’variant of working class values, born of the experience of particularly intense disadvantage and exclusion. The group’s base is in the Northstreet community, which historically condoned a level of petty criminality as a response to the absolute poverty experienced by its residents. Internal divisions, economic resurgence and urban renewal have altered the way of life for the majority of the residents of this public housing complex, which has rendered the young offenders both a symbolic reminder of the past, and an obstacle to community leadership attempts to represent contemporary Northstreet as a ‘respectable area’. While developments in policing strategies have in turn blurred the traditional opposition between the Gardai and working-class communities, The Crew and the police force nevertheless continue to construct each other as opponents, engaging in a game-like conflict fuelled by the clash 'street' and 'decent' values.

Dublin: Technological University Dublin, 2007. 249p.

By the Fines and Fees Justice Center (FFJC)

Every young person who comes into contact with Florida’s courts — regardless of guilt or innocence — is saddled with fees. Florida law authorizes 31 different court fees, costs and surcharges to be imposed on youth and their families. Together, these fees are quietly leading our youth, and their families, down a path of inescapable debt and poverty.

This report outlines the catastrophic consequences of juvenile fee debt for Florida’s children, families, and economy including: increased poverty, increased recidivism, and the exacerbation of racial disparities in the justice system. It also shows how the accumulation of fee debt is particularly damaging for Black youth and youth in the child welfare system.

Using county-level and statewide data, the report highlights the futility of both government, and private collection efforts, arguing that the costs of fee assessment and collection far outweigh the meager revenue received from such efforts.

Philadelphia: Fines and Fees Justice Center, 2022. 23p.

By Karen U. Lindell and Katrina L. Goodjoint

Since the U.S. Supreme Court’s decision in Roper v. Simmons banning the death penalty for young people under the age of 18, the principle that “kids are different” has come to permeate the justice system’s approach to young people. The developmental differences between adolescents and adults are now codified in numerous state statutes, have been cited in countless court decisions, and are foundational concepts in juvenile defense. And, while there is much work still to be done, the shift toward a developmental approach to youth justice has contributed to dramatic reductions in youth incarceration rates over the last decade.1 Yet even the Supreme Court has acknowledged, “[t]he qualities that distinguish juveniles from adults do not disappear when an individual turns 18.”2 People do not transform from children into adults on their 18th birthdays; instead the transition to adulthood is gradual and highly individualized.

The report begins by describing the defining characteristics of emerging adulthood and laying out the case for reforming the justice system’s approach to emerging adults. The report then examines examples and lessons from around the country where reforms are underway, including raising the age of juvenile court jurisdiction, reforming criminal justice procedures and practices, and using support from systems outside of the justice field. Finally, the report presents an in-depth look at the legal provisions and programs impacting emerging adults in the six states of the Great Lakes region—Illinois, Indiana, Michigan, Minnesota, Ohio, and Wisconsin. Our hope is that this report provides policymakers and advocates in each of those states, as well as elsewhere, greater tools to reshape justice for emerging adults in their jurisdictions.

Philadelphia, PA: Juvenile Law Center, 2020. 96p.

By Nadia Mozaffar, Kate Burdick, Maura McInerney, Kristina Moon, Katherine Dunn, Stephanie C. Burke and Naomi E. Goldstein

On any given day across the country, more than 48,000 youth are confined to juvenile justice facilities, where they are held for weeks, or even months at a time/

These youth are held in facilities that not only take them away from their homes, but also their schools. And while these facilities provide classes to prevent young people from falling behind in their schoolwork, many return to their schools to discover that they did not receive full academic credit for their work, that there is no record of their credits or that their credits will not count toward graduation. In other words, they discover that despite their best efforts to succeed, the juvenile justice system failed them. In fact, research spanning the last 20 years — including anecdotal reports from youth, families, advocates and others — describes rampant credit transfer problems. What’s more, the research in this report confirms that it continues to be a problem on a national scale, despite recently expanded mandates under the Every Student Succeeds Act and the Juvenile Justice Delinquency Prevention Act, federal laws requiring states to have procedures for timely assessment and transfer of credits. This report, Credit Overdue: How States Can Mitigate Academic Credit Transfer Problems for Youth in the Juvenile Justice System, is the first of its kind to analyze this problem from a national perspective, including the consequences youth experience due to the system's failure. The report also examines the legislative solutions necessary to ensure youth receive the academic credits they are due.

Philadelphia, PA: Juvenile Law Center, Education Law Center-PA, Drexel University and the Southern Poverty Law Center, 2022. 54p.

By John Pitts

This book provides an account of the emergence, nature and impact of armed youth gangs in an East London Borough over the last decade. It describes the challenges these armed young men and women pose to their communities, those charged with preventing crime and those struggling to vouchsafe 'community safety'. While the focus of the book is 'local', the processes it outlines and the effects it chronicles have both a national and international relevance.

It argues that the main reason behind the emergence of the armed youth gang has been the coalesence of two previously discreet socially deviant groups; the rowdy, episodically criminal, adolescent peer group on the one hand and the locally-based organized criminal network on the other.

The book analyses the impact of the globalisation of the drugs trade and the consequent shift in the focus of local organized crime from the 'blag' to the 'business'. It also discusses how socio-economic and cultural factors, as well as family and neighbourhood histories and loyalties and localized racial antagonisms all play their part in the emergence of the armed youth gang.

Cullompton, Devon, UK: Willan Publishing, 2008. 188p.

By Juanjo Medina, Andreas Cebulla, Andy Ross, Jon Shute, and Judith Aldridge

Youth gangs have received widespread political and media attention in the last decade. Gang membership has been linked to violent crime among young people, particularly in cases of gun and knife crime. More recently, this focus on gang membership among young people has been amplified by the rioting in some UK cities in summer 2011. Based on the suspected link between gangs and violent crime, government and different agencies have begun to develop policy responses to gangs. In November 2011, the government published its cross-government strategy to combat gang and youth violence. Alongside this, police forces and local authorities are drawing on US models to tackle gangs, including the formation of dedicated units and multi-agency teams. This study aims to enhance the evidence base for the developing policy context. We have used data from the Offending, Crime and Justice Survey (OCJS) to explore the circumstances that lead to young people joining, remaining, and leaving gangs in England and Wales. The OCJS provides the best nationally representative data available on young people’s victimisation and offending in the UK. Our findings, which are discussed in more detail in this briefing paper, are that gang membership increases the chances of offending, antisocial behaviour, and drug use among young people. This finding vindicates the current policy approach of treating gang membership as a distinct part of crime prevention and youth policy.

Manchester, UK: Centre for Criminology and Criminal Justice at the University of Manchester and NatCen Social Research,, 2013? 13p.

By Children’s Commissioner for England

This report investigates what it means to be a child gang member in England. It estimates how many children in England are in gangs, and looks at the risks factors which make it more likely for a child to end up being groomed for gang membership. Finally, it questions whether those responsible for safeguarding children are responding adequately to the rise in gang violence and how children can better be kept safe. I have been shocked to discover that many of those responsible for the protection of children in their local areas seem to have no idea where to start, despite hundreds of thousands of children being at risk. In this, I draw parallels with CSE a decade ago – before children being sexually exploited were recognised as victims and not perpetrators, and the adults supposed to protect them stopped turning a blind eye to widescale abuse. Our research presented here estimates there are 27,000 children in England who identify as a gang member, only a fraction of whom are known to children’s services. Their experiences vary widely. For some, being in a gang entails little more than putting a hashtag on social media. For others it can be far more serious and dangerous. Many of the children who identify as gang members feel they have no choice or no better options. Some are groomed and exploited by gangs but never identify as members. Often it is these children, described to me once as ‘collateral’, who are the most vulnerable and at risk.

London: Children’s Commissioner for England, 2019. 39p.

By Jesse Jannetta; Rod Martinez; Paige Thompson; Janine M. Zweig; Lily Robin; Leigh Courtney; Lindsey Cramer; Storm Ervin; Andreea Matei; Krista White

The recommended strategies are derived from research on the impact of various efforts to reduce shootings and homicides committed by youth between the ages of 10 and 25 in gangs/groups and with the use of guns. Research indicates that a common feature of the most effective efforts involves collaborations among law enforcement agencies, local government agencies, and community organizations in designing, implementing, and testing policies and practices designed to prevent and respond to violence committed by youth gangs/groups. Recommendations are divided into two sections. Those in the first section address how to build anti-violence infrastructure to ensure planned efforts span the entire jurisdiction, have multiple components, are adaptable to variable circumstances, are sustainable over time, and are targeted at violence committed by youth gangs/groups. The second section focuses on how to develop effective programs and interventions that operate within and benefit from the existing infrastructure. Nine actions needed to develop an anti-violence infrastructure are discussed. There are some common titles given workers and types of work done by those employed in these antiviolence efforts outside of traditional justice agencies. Throughout this guide, four common job titles in such work are a “case manager,” “credible messenger.” ”outreach worker,” and a “violence interrupter.” The guide describes the functions of each of these jobs in the context of what research has indicated to be an effective infrastructure for countering youth gang/group violence. Some examples are provided of U.S. cities that have an established infrastructure for addressing violence by youth gangs/groups.

Washington, DC: The Urban Institute, 2022. 99p.

By Tom Clarke

This analysis aims to provide information on the scale of gang associated children and young people (CYP) identified by statutory services and their characteristics, with a particular focus on overlaps with other vulnerable groups. To do this we present analysis of two groups of CYP:  CYP assessed by children’s services during the year to March 2018. This is taken from the Children in Need Census (CIN) collected by the Department for Education and is matched where possible to the National Pupil Database (NPD).  CYP receiving an Asset Plus assessment in the 12 months to September 2018. This is a bespoke collection from Youth Offending Teams (YOT) in England and received responses from 130 out of 137 areas. Both of these data sources have extensive information on the characteristics of the CYP assessed, including practitioner assessed markers of whether a child is gang associated or not. This allows us to examine the scale of children marked as being gang associated in both data sources and to examine differences between these gang associated CYP and other CYP assessed on other characteristics recorded in the datasets.

London: Children’s Commissioner for England, 2019, 39p.

By José Miguel Cruz, Jonathan D. Rosen, Luis Enrique Amaya and Yulia Vorobyeva

Can a member of a Salvadoran youth gang, locally known as “maras,” leave the gang and start a new life away from crime and violence? To answer this question, the Kimberly Green Latin American and Caribbean Center and the Jack D. Gordon Institute for Public Policy at Florida International University, with the support of the Fundación Nacional para el Desarrollo (FUNDE), conducted a study with Salvadoran gang members and former gang members across the country. The study, which is based on a survey with a combination of a convenience and purposive sample of 1,196 respondents with record of gang membership and 32 in-depth interviews, reveals that desistance from the gang is possible in El Salvador but, in the short-term, it depends on two factors. First, it depends on the individual and active commitment of gang members to abandon gang life and stop partaking in violent activities. Second, it depends on the tacit or explicit consent of the leaders of the gang organization. Hence, in El Salvador, gang desistance—which, according to some authors, is the declining probability of gang membership—involves the acquiescence of the group. The study builds on previous academic scholarship on gangs in El Salvador and Central America as well as on the general criminological literature on youth gangs. The results indicate that youth gangs remain a predominantly male phenomenon and that the average age of joining the gang does not seem to have changed significantly in comparison with data from 10 years ago. Nearly 40% of the subjects interviewed for this study are active members of the gang, while the rest are in different stages of calming down and leaving the gang.

Miami: Florida International University, 2017. 75p.

By Washington Office of Latin America

A sk someone to describe a “gang member” and the response will be almost immediate. Most people, whether they have ever encountered an actual gang member or not, will describe a gun-toting, tattooed criminal. Ask someone to explain what a “Central American youth gang” is and the respondent is likely to paint an image of a dangerous network of criminal gangs, based in Central America and spreading their tentacles from there into the United States and other countries. Fueled by sometimes one-sided media coverage, these terms carry with them a strong set of prejudices and assumptions. The reality is far more complex. Gangs and gang members are very serious threats to public security in some communities both in Central America and in the United States. But the character and the origins of Central American youth gangs, and the problem of youth gang violence, are not simple to understand or address. They have both local and transnational aspects and are a social as well as a law enforcement issue. In Central America, youth gangs have existed since at least the 1960s, although their character changed significantly in the 1990s. To understand youth gangs in Central American immigrant communities in the United States, one must recognize that youth gangs in the U.S. can be traced back as far as the 1780s,

Washington, DC: WOLA, 2006. 32p.

By Walter B. Miller

That original report dispelled the popular notion that gang violence was no longer a problem in this country. Based on findings from 26 U.S. cities and metropolitan counties, including interviews with over 450 representatives of police departments, public and private youth service agencies, courts, and other groups, the author found that, compared to youth gangs from previous eras, the gangs of the 1970's tended to be more violent, more likely to use guns, less formally organized, and more active within the public schools. The original research provided baseline national estimates of the numbers, locations, and criminal activities of juvenile and youth gangs, and conceptualized the law-violating youth group as a basic unit in the study of gangs and other forms of collective youth crime. The predictions made in the report have been borne out in the intervening years by empirical data: that absent a new commitment to gang control, the youth gang problem would worsen; that the gang situation in California represents the wave of the future for the rest of the U.S.; that social and economic conditions associated with gangs will not change in a direction that reduces gang crime; and that gun control efforts will be ineffective in decreasing the availability of weapons to youth. 3 charts, 33 tables, and 5 appendixes

Washington, DC: U.S. Office of Juvenile Justice and Delinquency Prevention, 1982. 177p.

By J. Hodgkinson, et al.

Are ‘comprehensive’ interventions more effective at reducing gang related criminal activity and anti-social behaviour than usual service provision? The meta-analysis of nine studies found that, overall, the comprehensive interventions had a positive, but not statistically significant, effect in reducing crime outcomes compared to usual service provision (i.e. whatever was in place either in a comparison area or before the specific intervention).

None of the studies included in the review considered the cost-benefit of any of the interventions. This kind of information is important to facilitate a more informed decision when choosing between different strategies. Any advantage of comprehensive interventions over non-comprehensive interventions may, for example, come at a greater financial cost.

London: Institute of Education, University of London, 2009. 155p.

By Laura Dunbar

Youth gangs are not a new phenomenon in Canada. Theoretical and empirical research and evaluation efforts continue with the goal of better understanding and responding to this issue. Advances have been made in defining the nature of youth gangs and their activities, the motivations for joining, and the risk and protective factors that influence involvement in a gang lifestyle. While a precise measure of youth gang involvement and prevalence of their activities in Canada is not currently available, in the last number of years strides have been made in understanding affiliation among several key populations, namely Aboriginal youth, immigrant youth and young women. Greater insight into specific risk factors, pathways to involvement and desistance, and guidance for prevention and intervention efforts can assist in the future development of solutions to address youth gang involvement and gang-related activities in Canada. Public Safety Canada continues to support effective youth gang prevention and intervention strategies that are known to work based on empirical evidence and lessons learned from past implementation and evaluation experiences.

Ottawa: Public Safety Canada, 2017.30p.

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By Emma Disley and Mark Liddle

The aim of this study was to understand perceptions of the nature of urban street gangs and whether these gangs have changed in recent years in the 33 areas1 that make up the Government’s Ending Gang and Youth Violence (EGYV) programme (HM Government, 2011a). The EGYV programme aims to improve the way that gangs are tackled locally through providing peer support to local areas to help prevent young people becoming involved in violence; providing exit routes for those already involved in gangs; and ensuring that appropriate enforcement responses are put in place to address challenges associated with gangs. The study was based on the perceptions of practitioners working on gang-related issues as well as individuals who were current or ex-gang members, or associated with, or affiliated to gangs (referred to throughout as gang associates). It investigated the extent to which there were perceived similarities or differences in the nature of street gangs in EGYV areas and whether or not gangs were thought to have changed in the last two years. It also explored the extent to which there were common or divergent trends in perceptions at national or local levels. It was not the purpose of this study to evaluate the effectiveness of the EGYV programme or local measures to address gang and youth violence. The findings, based largely on practitioners’ perceptions, highlight issues and possible trends that could be more fully explored and investigated locally or nationally, using a wider range of evidence and information.

London: Home Office, 2016. 107p.

By Max G. Manwaring

The intent of this monograph is to identify some of the most salient characteristics of contemporary criminal street gangs (that is, the gang phenomenon or third generation gangs), and to explain the linkage to insurgency. As a corollary, Dr. Max G. Manwaring argues that gang-related crime, in conjunction with the instability it wreaks upon governments, is now a serious national security and sovereignty problem in important parts of the global community. Although differences between gangs and insurgents exist, in terms of original motives and modes of operation, this linkage infers that the gang phenomenon is a mutated form of urban insurgency. That is, these nonstate actors must eventually seize political power to guarantee the freedom of action and the commercial environment they want. The common denominator that can link gangs and insurgents is that some gangs’ and insurgents’ ultimate objective is to depose or control the governments of targeted countries. Thus, a new kind of war is brewing in the global security arena. It involves youthful gangs that make up for their lack of raw conventional power in two ways. First, they rely on their “street smarts,” and generally use coercion, corruption, and co-optation to achieve their ends. Second, more mature gangs (i.e., third generation gangs) also rely on loose alliances with organized criminals and drug traffickers to gain additional resources, expand geographical parameters, and attain larger market shares. This monograph contributes significantly to an understanding of the new enemies and the new kinds of threats characteristic of a world in which instability and irregular conflict are no longer on the margins of global politics. For those responsible for making and implementing national security policy in the United States and elsewhere in the world, the analysis of the new threats provided by the author is compelling.

Strategic Studies Institute . 2005. 53p.

Edited by Winifred L. Reed and Scott H. Decker

The projects reflect a diverse set of methodologies and interests. They present a representative selection of the National Institute of Justice’s (NIJ) collection of gang-related research. Chapter 1 discusses a decade of gang research and the findings of the NIJ gang portfolio. Each research project is summarized. Chapter 2 presents the evolution of street gangs and examines form and variation. Chapter 3 describes the risk factors, delinquency, and victimization risk for young women in street gangs. Chapter 4 focuses on youth gang homicides in the 1990's. Three issues of importance to the understanding of gang homicide -- measurement, trends, and correlates are examined. The National Evaluation of the Gang Resistance Education and Training (G.R.E.A.T.) Program is outlined in chapter 5. This program is classroom-based and consists of eight lessons designed to teach middle school students life skills that enable them to resist the pressures of gangs, drugs, and delinquency. Chapter 6 evaluates Nevada’s antigang legislation and gang prosecution units. Chapter 7, presents an evaluation of a task force approach to gangs. The task force, known as JUDGE (Jurisdictions Unified for Drug Gang Enforcement), did not clear up the question of whether specific gang enforcement yielded better results than did traditional forms of law enforcement. Chapter 8 describes an evaluation of gang prevention programs for female adolescents. It was found that gang membership showed as much variation for young women as it did for men. Chapter 9 focuses on reducing gang violence in Boston. Chapter 10 describes the development of a GIS-based regional gang incident tracking system. Recommendations for future directions in gang research include incorporating some of the insights of research literature outside the gang field; funding collaborative efforts; and considering the use of a dynamic problem-solving approach.

Washington, DC: U.S. National Institute of Justice, 2002. 320p.

By Irving Spergel

The review describes what is known about youth gangs in the United States; explains gang phenomena, primarily within social disorganization and poverty perspectives; and describes and assesses organized responses to the problem. The first part of the report contains six chapters on the "Nature of the Problem." The first chapter considers definitional issues and data sources, followed by five chapters that address the scope and seriousness of the gang problem, the group character of youth gangs, membership demographics, membership experience, and the social contexts of youth gang development. The second part of the report, "Response to the Problem," focuses on organized responses to the gang problem, with attention to existing and evolving strategies, policies, and programs of youth service, criminal justice, and community-based organizations, as well as Federal and State legislative initiatives. One chapter in this section discusses the historical roots and development of key antigang strategies, followed by a chapter that discusses social intervention strategies, with attention to evaluation. Other chapters consider police gang-suppression strategies and the approaches of prosecutors, defense attorneys, and judges in addressing the gang problem. Remaining chapters address current emerging probation, parole, and corrections strategies; the importance of social opportunities, especially improved education and employment opportunities for gang youth; and community mobilization to counter gangs. The final chapter summarizes key findings of the review and provides policy recommendations.

Chicago: National Youth Gang Suppression and Intervention Program School of Social Service Administration University of Chicago, 1991. 212p.

By Walter B. Miller

The prevalence and seriousness of gang problems have fluctuated over time, with gang activity escalating during some periods and diminishing during others. The last three decades of the 20th century were characterized by a major escalation of youth gang problems throughout the Nation. This report presents detailed information on the numbers and specific identities of gang problem localities, the size of these localities, rates of growth, and location by State and region of the cities, towns, villages, and counties that reported gang problems between the 1970’s and late 1990’s. By the late 1990’s, 3,700 identified localities in the United States, totaling the highest number ever reported presence of gang problems. In the 1970’s, 19 States reported gang problems; by the late 1990’s, all 50 States and the District of Columbia had reported gang problems. The States with the largest number of gang-problem cities in 1998 were California, Illinois, Texas, Florida, and Ohio. Nationwide, there was a substantial decrease in the concentration of gang cities in the higher ranking States as gang problems continued to spread to new States. The regional location of gang cities changed radically during the three-decade period. In the 1970’s, the West ranked the highest in the reported number of gang cities, and the South ranked the lowest. In 1998, the South ranked second. In the late 1990’s, there were approximately 200 cities with populations of 100,000 or more, and every one of these large cities reported youth gang problems. Gang problems however, were not confined to large cities. One of the best documented developments of this period was a striking increase in the growth of gang problems in the Nation’s smaller cities, towns, and villages. Reasons for the striking increase in the number of gang problem localities are discussed under seven headings: drugs, immigration, gang names and alliances, migration, government policies, female-headed households, and gang subculture and the media. An analysis of projected growth rates of gang problem cities provides a basis for predicting future trends in the number of gang cities. The data provides support for a prediction that the rate of growth that prevailed in the later 1990’s will decrease in the early 2000’s and a prediction that the actual number of gang localities will decrease.

Washington, DC: U.S. Office of Juvenile Justice and Delinquency Prevention, 2001. 93p.